Abstract
A new type of cool thermal storage, based on solid-liquid-vapor multiple phase transformation operation, has been introduced. In this process, ice is made for cool thermal storage at reduced pressure during off-peak power consumption hours and melted for producing chilled water during on-peak power consumption hours. The phenomena of ice storage, produced by vacuum freezing of water with sublimation of ice at the free surface, have been investigated. The equations for estimating the temperature-time history in the ice layer have been derived. The penetration distance of solidification from the original surface is also obtained from the mass balance. The estimation of the capacity of cool thermal storage has been illustrated with a constant-volume rate of sublimation as parameter.
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